// 循环精灵图
var local_navs = document.querySelectorAll('.local_nav_img')
// console.log(local_navs);
for (var i = 0; i < local_navs.length; i++) {
    var index = i * 32;
    local_navs[i].style.backgroundPosition = '0px -' + index + 'px';
}
